Adrian P wrote:

.....

Everywhere is written that FreeBSD is the best OS for time keeper,
since its kernel supports nanosecond accuracies. However, if GPS 18x
LVC PPS signal has only microsecond accuracy, then I suppose there is
no point on using FreeBSD, any linux would be okay as well. So what do
you think, looking from NTP point of view only, is this nanosecond
accuracy the only reason why someone would use FreeBSD, or there are
some other reasons as well? I see you have experience with all kind of
OSes.

I think the combination of hardware used is at least as important
as the OS.

<http://www.febo.com/pages/soekris/> 100ns accuracy

<http://www.synclab.org/radclock/> An alternative to ntpd



David

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